JPH09223898A - Surface mounting machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve mount efficiency by eliminating wasteful nozzle vertical movements at the time of mounting components. SOLUTION: A nozzle member 3 mounted on a head unit 1 is vertically moved in accordance with switching of air supply/discharge to/from an air cylinder 10 by a switching valve 18. Supply of negative pressure to the nozzle member 3 is intermitted by an on/off valve 21. A descent end sensor 7 for detecting a bearing 5 mounted on a nozzle shaft 3a when the nozzle member 3 has reached a descent end region and a negative pressure control sensor 8 for detecting the bearing 5 right before the nozzle member 3 reaches the descent end region. When mounting parts, the on/off valve 21 is turned off to shut off negative pressure based on the detection of the negative pressure control sensor 8. The negative pressure control sensor 8 is provided to detect the bearing 5 at timing of releasing a part attracting state when the nozzle part 3 has reached the descent end position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is constructed such that a nozzle unit mounted on a head unit movable up and down across a component supply section and a component mounting section adsorbs the component and mounts it on a printed circuit board. The present invention relates to a surface mounter.

[0002]

2. Description of the Related Art Conventionally, a nozzle unit for picking up a component is mounted on a head unit movable up and down and rotatable on a component supply unit and a printed circuit board positioned at a predetermined working position. 2. Description of the Related Art A surface mounter is generally known in which an electronic component is sucked by a negative pressure supplied and is transferred from a component supply unit onto a printed circuit board for mounting.

In this type of mounting machine, if the head unit moves with the nozzle member set in the descending end region, the nozzle tip may interfere with the equipment of the component supply section or components mounted on the printed circuit board. There is. for that reason,
Usually, a sensor for detecting that the nozzle member has reached the lower end region is provided, and the movement of the head unit is controlled based on the detection of the nozzle member by this sensor.

[0004]

SUMMARY OF THE INVENTION In this type of mounting machine,
In order to separate the suction component from the nozzle member and mount it on the printed circuit board, it is required to interrupt the negative pressure and release the component suction state at a predetermined timing when the nozzle member reaches the descending end region. In the conventional device, since the sensor detects the arrival of the nozzle member in the descending end region, this is generally used to control the valve for interrupting the negative pressure.

However, in such control, the negative pressure cannot be cut off at the above-mentioned predetermined timing at present due to improvement of the responsiveness of the valve.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a surface mounter capable of increasing the mounting efficiency by eliminating waste of the nozzle ascending / descending operation when mounting components. .

[0007]

A surface mounter according to the present invention has a movable head unit equipped with a nozzle member for adsorbing a component so that the nozzle member can be moved up and down, and the nozzle member adsorbs a component from a component supply section. In a surface mounter configured to be mounted on a printed circuit board, a detection unit that detects a relative height position of the nozzle member with respect to the head unit,
Intermittent means for intermittently supplying a negative pressure for sucking components to the nozzle member based on the detection of the height position by the detecting means, the detecting means when the nozzle member reaches the descending end region and It is configured to detect each nozzle member when the member reaches a predetermined height position,
The connecting / disconnecting means is configured to shut off the negative pressure when the nozzle member is descended in the component mounting operation and when the detecting means detects that the nozzle member reaches the predetermined height position. Is.

According to this surface mounter, the interrupting means is operated based on the detection of the nozzle member that has reached the position above the lower end position, so that the component suction state is set at the timing when the nozzle member reaches the lower end position. It is possible to cancel.

In particular, the detection means is composed of a pair of upper and lower sensors provided in the head unit and a detected portion common to the sensors provided in the nozzle member, or a sensor provided in the head unit, If the detection means is composed of a pair of upper and lower detection target parts with respect to the sensor provided in the nozzle member, the above operation can be obtained with a simple configuration.

[0010]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 schematically shows a head unit of a surface mounting machine (hereinafter abbreviated as mounting machine) according to an embodiment of the present invention. The head unit 1 is provided so as to be movable in a plane above a printed circuit board held at a predetermined work position, and a mounted nozzle member 3 for sucking and mounting a component is used to mount an electronic component such as an IC. It is configured to be transferred from the supply unit to the printed circuit board for mounting.

The nozzle member 3 includes a hollow nozzle shaft 3a and a nozzle 3 detachably attached to the lower end thereof.
b and is attached to the frame 2 of the head unit 1 via the nozzle guide 4 so as to be vertically movable and rotatable. That is, the nozzle guide 4 is rotatably attached to the frame 2, and the nozzle shaft 3a is vertically movably fitted to the nozzle guide 4.

A bearing 5 is attached to an upper portion of the nozzle shaft 3a, and a spring 6 is attached to a lower portion of the nozzle shaft 3a. The spring 6 urges the nozzle shaft 3a upward through the bearing 5. ing. The outer ring portion of the bearing 5 slides along the vertical guide 2a formed on the frame 2 as the nozzle shaft 3a moves up and down, whereby the nozzle shaft 3a moves up and down when the nozzle moves up and down. The shake is suppressed.

A pair of upper and lower sensors are attached to the frame 2 at positions facing the nozzle shaft 3a, and the bearings 5 are sequentially detected by these sensors as the nozzle shaft 3a descends. ing. Specifically, the descending end sensor 7 that detects the bearing 5 when the nozzle member 3 reaches the descending end region, and this descending end sensor 7 are arranged separately, and the nozzle member 3 has the bearing 5 at a predetermined height. And a negative pressure control sensor 8 for detecting

The negative pressure control sensor 8 detects the above-mentioned bearing 5 so as to operate the on / off valve 21 for disconnecting the negative pressure, which will be described later, in synchronization with the lowering operation of the nozzle member 3.
In order to detect the bearing 5 at a timing such that the component suction state can be released when the nozzle member 3 has just reached the descending end position, the descending speed of the nozzle 3 and the response time, that is, after detecting the bearing, are actually detected. It is provided in consideration of a time delay until the negative pressure is cut off and the part is separated from the nozzle tip.

Each of the sensors 7 and 8 is, for example, an optical sensor having a light emitting portion and a light receiving portion, and the light reflected by the bearing surface is received by the light receiving portion to detect the bearing 5. It has become.

Above the location where the nozzle member 3 is provided,
An air cylinder 10 is provided, which is integrated with the frame 2 and is provided with a switching valve 18 for driving the air cylinder, which is connected to an air supply source (not shown) and switches air supply / discharge to / from the air cylinder 10. There is. The upper end of the nozzle shaft of the nozzle member 3 is projected into the air cylinder 10.

The air cylinder 10 has a piston 11 therein, and pressure chambers 12 and 13 above and below the piston 11, respectively, and these pressure chambers 12 and 13 are connected to a port 14 respectively. , 15 and supply / discharge passages 16, 17 are connected to the switching valve 18. While the air generated by the air supply source is being supplied to the air cylinder 10, the pressure chambers 1
The piston 11 is moved up and down by switching the supply and discharge of air to and from the valves 2 and 13 by the switching valve 18. Specifically, when the switching valve 18 in which the air is supplied to the upper pressure chamber 12 and the air is discharged from the lower pressure chamber 13 is in the ON state, the piston 11 descends, and conversely, the lower pressure When the switching valve 18 in which air is supplied from the upper pressure chamber 12 while air is being supplied to the chamber 13 is in the off state, the piston 11 is raised.

A cylindrical sleeve 11a is integrally provided at the lower end of the piston 11, and the air cylinder 10
The upper end portion of the nozzle shaft of the nozzle member 3 that is thrust into the inside is rotatably inserted into the sleeve 11a.

A negative pressure introducing port 23 is provided above the air cylinder 10, and the negative pressure introducing port 23 is provided.
Is connected to a negative pressure supply source (not shown) via a negative pressure supply passage 20 and an on / off valve 21 that are integrally provided in the frame 2. The negative pressure generated by the negative pressure supply source is supplied to the nozzle member 3 through the negative pressure inlet 23 and the inside of the piston 11 of the air cylinder 10, and the negative pressure supply to the nozzle member 3 is turned on and off. It is designed to be intermittently operated by a valve 21. Further, a negative pressure amount detection sensor 22 is provided on the negative pressure supply passage 20 so that the negative pressure amount is controlled. In this head unit 1, the negative pressure supply passage 20 and the on / off valve 21 are directly provided in the frame 2 of the head unit 1 in this way to collect the negative pressure supply system in the vicinity of the nozzles, and thereby the negative pressure to the nozzle member 3 is reduced. The responsiveness at the time of intermittent supply or adjustment of the supply amount can be enhanced.

Although not shown, the head unit 1 is equipped with a belt transmission mechanism having a servomotor as a drive source, and the belt transmission mechanism is provided with the nozzle guide 4 and the nozzle shaft. By connecting 3a, the nozzle member 3 is rotated according to the forward and reverse rotation drive of the servo motor.

By the way, the surface mounter equipped with the head unit 1 is provided with a controller (not shown) having a microcomputer as a constituent element. The pressure control sensor 8, the switching valve 18, the on / off valve 21 and the like are all electrically connected to this controller. Then, at the time of mounting, the head unit 1 is controlled by this controller as follows.

That is, when the mounting operation is started, first, the head unit 1 is arranged above the component supply section, and the switching valve 18 is turned on. As a result, the piston 11 is lowered in the air cylinder 10, and as the piston 11 is lowered, the nozzle shaft 3a is pushed down via the bearing 5, and the nozzle member 3 is moved to the lower end position. Further, the on / off valve 21 is turned on (communication state) at the timing when the nozzle member 3 starts descending, whereby the supply of negative pressure to the nozzle member 3 is started. Thus, when the nozzle member 3 reaches the descending end position, the negative pressure acts on the component to suck the component.

When the suction of the components is completed, that is, when the bearing 5 is detected by the descending end sensor 7 and the arrival of the nozzle member 3 at the descending end position is detected, the switching valve 18 is synchronized with this. Is turned off, and the piston 11 is raised by this, and the nozzle shaft 3a follows the piston 11 by the biasing force of the spring 6 and is moved to the raised end position. As a result, the components are attracted to the nozzle member 3,
Picked up from the parts supply section. If the bearing 5 is continuously detected by the descending end sensor 7 for a predetermined time after the switching valve 18 is turned off, it is determined that an abnormality has occurred in the drive system of the air cylinder 10 and the like. The operator or the like is notified by a notification means such as a lamp or a buzzer without moving the unit 1.

When a component is picked up from the component supply unit, the head unit 1 is then moved to above the printed circuit board and the switching valve 18 is turned on. As a result, the nozzle member 3 is moved to the lower end position.
Further, at this time, the belt transmission mechanism for rotating the nozzle member is also operated to position the component in the rotational direction.

Then, as shown by the solid line in FIG. 2, when the bearing 5 is detected by the negative pressure control sensor 8 as the nozzle member 3 descends, the on / off valve 21 is switched off and a negative pressure is applied to the nozzle member 3. Supply of pressure is cut off,
As a result, the component is separated from the nozzle member 3 and mounted on the printed board. At this time, the negative pressure control sensor 8 is arranged in consideration of the descending speed of the nozzle 3 and the response delay time until the component suction state is released due to the interruption of the negative pressure supply as described above. When the member 3 has just reached the descending end position (the position indicated by the chain double-dashed line in FIG. 2), the component suction state is released and the component is mounted on the printed board.

When component mounting is completed, the switching valve 18 is switched off in synchronization with this, the nozzle member 3 is moved to the rising end position, and then the head unit 1 is moved for the next component suction. It is moved to the parts supply section. At this time, after the switching valve 18 is turned off,
When the bearing 5 is continuously detected by the descending end sensor 7 for a predetermined time or longer, the operator or the like is notified without moving the head unit 1 as in the case of picking up components.

As described above, in the mounting machine described above, the detection of the arrival of the nozzle member 3 at the lower end region and the control of shutting off the negative pressure supply at the time of component mounting, that is, the control of switching the on / off valve 21 to off. Separate sensors (falling edge sensor 7,
The bearing 5 is detected based on the detection of the bearing 5 by the negative pressure control sensor 8), and the bearing 5 is detected at such a timing that the component suction state can be released when the nozzle member 3 just reaches the lower end position. Since the negative pressure control sensor 8 is provided in consideration of the descending speed of the nozzle member 3, the response time, etc., it is necessary to wait the nozzle member at the descending end position at the time of component mounting like the conventional device of this type. There is no. Therefore, the cycle time can be shortened as much as the waiting time is unnecessary, and the mounting efficiency can be improved.

The head unit 1 is an example of a head unit applied to the mounting machine of the present invention, and its specific configuration can be appropriately changed without departing from the gist of the present invention.

For example, in the head unit 1, the bearing 5 mounted on the nozzle shaft 3a is detected by the descending end sensor 7 and the negative pressure control sensor 8, respectively. The detected pieces may be attached, and each of these detected pieces may be sequentially detected by a single sensor fixed to the frame 2 as the nozzle member 3 descends. In this case, the negative pressure supply may be cut off based on the detection of the lower detection piece, and the arrival of the nozzle member 3 at the lower end position may be detected based on the detection of the upper detection piece.

Further, in the above embodiment, the surface mounter for mounting components by the single nozzle member 3 mounted on the head unit 1 has been described as an example. However, the present invention uses multiple nozzle members in the head unit. It can also be applied to a surface mounter that mounts and mounts a large number of components in succession. In the mounting machine including a large number of nozzle members 3 as described above, the above-described waiting time is not required for each nozzle member, which is advantageous because the cycle time can be more effectively shortened.

Further, in the above embodiment, the optical sensor is used as the lowering edge sensor 7 and the negative pressure control sensor 8. However, the kind of the sensor is not limited to such an optical sensor and the periphery of the nozzle is used. It may be appropriately selected according to the structure of the above.

[0033]

As described above, according to the present invention, the detecting means for detecting the relative height position of the nozzle member with respect to the head unit, and the parts for the nozzle member based on the detection of the height position by the detecting means. An interruption means for interrupting the supply of the negative pressure for suction is provided, and the detection means is configured to detect the nozzle member when the nozzle member reaches the descending end region and when the nozzle member reaches a predetermined height position. In addition, since the interrupting means is configured to interrupt the negative pressure supply based on the detection of the arrival of the nozzle member to the predetermined height position by the detecting means, release of the component suction state by interrupting the negative pressure, It can be performed at the timing when the nozzle member reaches the descending end position. Therefore, as compared with the conventional device of this type in which the negative pressure shutoff control is performed based on the detection of the lower end position of the nozzle member, the nozzle ascending / descending operation at the time of component mounting has no waste, and the mounting efficiency is improved better. be able to.

In particular, in such an apparatus, the above-mentioned detection means is constituted by a pair of upper and lower sensors provided in the head unit and a detected portion common to the respective sensors provided in the nozzle member, or the head unit is provided with the detection means. If the detection means is composed of the sensor provided and a pair of upper and lower detection parts for the sensor provided in the nozzle member, the above-described operation can be obtained with a simple configuration.

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing a head unit applied to a surface mounting machine according to the present invention.

FIG. 2 is an enlarged view of an essential part showing the relationship between the nozzle member and the descending end sensor and the negative pressure control sensor during the descending operation.

[Explanation of symbols]

 1 Head Unit 2 Frame 3 Nozzle Member 3a Nozzle Shaft 3b Nozzle 7 Falling End Sensor 8 Negative Pressure Control Sensor 10 Air Cylinder 11 Piston 18 Switching Valve 21 On-off Valve

Claims (3)

[Claims] 1. A surface mounter configured such that a movable head unit is equipped with a nozzle member for adsorbing a component so as to be able to move up and down, and the nozzle member adsorbs a component from a component supply unit and mounts it on a printed circuit board. A detection means for detecting the relative height position of the nozzle member with respect to the head unit, and an interrupting means for interrupting the supply of the negative pressure for component suction to the nozzle member based on the detection of the height position by this detection means. And the detecting means is configured to detect the nozzle member when the nozzle member reaches the descending end region and when the nozzle member reaches a predetermined height position, and the disconnecting means is the component mounting. When the nozzle member is descending during the operation, the negative pressure is cut off based on the detection of the arrival of the nozzle member to the predetermined height position by the detection means. A surface mounter characterized by being formed. 2. The detection means comprises a pair of upper and lower sensors provided on the head unit, and a detected portion common to the sensors provided on the nozzle member. Surface mounter. 3. The detection means comprises a sensor provided on the head unit and a pair of upper and lower detection parts for the sensor provided on the nozzle member. Surface mounter.